Beaverlodge scenario – R&D128 David Copplestone January 2010
R&D128 Input Limited Reference selection of organisms – radionuclides selected – so used analogues analogues Converted water Default concentration concentrations from Bq/l factors
Analogue radionuclides Selected analogues for based on decay type and half-life, using method in EA Habitats Reports Pb-210 (Cs-137 – other beta gamma, half life > 10 days) Ra-226 (Pu-239 – other alpha) Th-230 (Pu-239 – other alpha)
Analogue organisms for variation Selected based on biology Phytoplankton selected for Chironomus based on dimensions - no biologically similar surrogate Alternative reference organism would be small benthic crustacea or zooplankton (which have same size & mass)
Calculation Activity concentration in biota (Bq kg -1 ) = activity concentration in water (Bq m -3 ) * default R&D128 concentration factor (m 3 kg -1 )
Site 13 - Dubyna Lake (shallow) No analytical data available for activity concentration in water Used sediment concentration factor to convert activity in sediment to activity in water
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